Alert archive / Colorado / Washington County
Weather alerts in Washington County, Colorado, 2022
170 weather alerts in 2022, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Washington County and its neighbors
Each county as a circle sized by its count in 2022. Tap one for its archive.
- Alerts
- 170
- Warnings
- 68
- Watches
- 30
- Advisories
- 32
- Busiest month
- July50 alerts
- Busiest day
- July 28, 202220 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
0 of 3 tornado warnings covering Washington County in 2022 had a tornado report inside them.
Washington County, 2022
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 3 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 26 | 7 | 73% | 11 | 55% | 18 min |
| Flash flood warnings | 3 | 1 | 67% | 2 | 50% | 65 min |
Each office's whole area, 2022
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Denver/Boulder, CO: tornado warnings | 15 | 4 | 73% | 13 | 31% | 12 min |
| NWS Denver/Boulder, CO: severe thunderstorm warnings | 139 | 43 | 69% | 123 | 66% | 20 min |
| NWS Denver/Boulder, CO: flash flood warnings | 63 | 17 | 73% | 38 | 76% | 62 min |
An office's figures cover every county it serves, including across state lines.
Verified by the Iowa Environmental Mesonet's Cow, which matches each storm-based warning with the local storm reports inside its polygon while it was in force, within 15 km of its edge: a tornado warning counts as verified on a tornado report, a severe thunderstorm warning on hail of 1 inch or more, a gust of 58 mph or more, or wind damage, a flash flood warning on a flash flood report. The false alarm ratio is the share of warnings with no such report; "inside a warning" is the probability of detection, the share of reports that fell inside one; lead time runs from the warning's issue to each report inside it, counting zero for a report that came first. A warning with no report is not proof nothing happened: reports come from spotters, the public and damage surveys, and are thin where few people live.
The alerts
Every alert, in the order issued. Times are local, Mountain Time. Each opens its own page with the text, the map, the radar and the sounding.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jan 1, 4:47 AM MST | Wind Chill Advisory | BOU | 27 hr |
| Jan 3, 2:37 PM MST | High Wind Warning | BOU | 26 hr |
| Jan 4, 2:54 PM MST | Winter Weather Advisory | BOU | 44 hr |
| Jan 5, 4:12 AM MST | Wind Chill Advisory | BOU | 28 hr |
| Jan 18, 2:49 PM MST | Winter Weather Advisory | BOU | 29 hr |
| Jan 24, 3:46 AM MST | Winter Weather Advisory | BOU | 37 hr |
| Jan 25, 6:52 AM MST | Mesoscale Discussion | SPC | 3 hr |
| Jan 31, 2:15 PM MST | Winter Weather Advisory | BOU | 54 hr |
| Feb 21, 3:32 AM MST | Wind Chill Advisory | BOU | 56 hr |
| Feb 23, 1:17 PM MST | Wind Chill Advisory | BOU | 19 hr |
| Mar 8, 3:05 AM MST | Winter Weather Advisory | BOU | 50 hr |
| Mar 21, 3:20 AM MDT | Winter Weather Advisory | BOU | 17 hr |
| Apr 4, 4:08 AM MDT | High Wind Watch | BOU | 25 hr |
| Apr 4, 4:08 AM MDT | High Wind Warning | BOU | 41 hr |
| Apr 4, 2:55 PM MDT | Fire Weather Watch | BOU | 5 hr |
| Apr 4, 7:58 PM MDT | Red Flag Warning | BOU | 25 hr |
| Apr 5, 4:00 AM MDT | Fire Weather Watch | BOU | 11 hr |
| Apr 5, 4:57 AM MDT | High Wind Watch | BOU | 10 hr |
| Apr 5, 2:59 PM MDT | High Wind Warning | BOU | 27 hr |
| Apr 5, 3:23 PM MDT | Red Flag Warning | BOU | 30 hr |
| Apr 6, 3:04 AM MDT | High Wind Watch | BOU | 11 hr |
| Apr 6, 3:17 AM MDT | Red Flag Warning | BOU | 41 hr |
| Apr 6, 10:54 AM MDT | Blowing Dust Advisory | BOU | 7 hr |
| Apr 6, 2:29 PM MDT | High Wind Warning | BOU | 29 hr |
| Apr 7, 11:23 AM MDT | Blowing Dust Advisory | BOU | 8 hr |
| Apr 8, 4:49 AM MDT | Fire Weather Watch | BOU | 24 hr |
| Apr 9, 4:44 AM MDT | Fire Weather Watch | BOU | 9 hr |
| Apr 9, 2:01 PM MDT | Red Flag Warning | BOU | 29 hr |
| Apr 10, 1:15 PM MDT | High Wind Warning | BOU | 6 hr |
| Apr 13, 2:14 PM MDT | Red Flag Warning | BOU | 29 hr |
| Apr 16, 4:41 AM MDT | Fire Weather Watch | BOU | 23 hr |
| Apr 16, 2:08 PM MDT | Red Flag Warning | BOU | 30 hr |
| Apr 20, 1:08 PM MDT | Fire Weather Watch | BOU | 13 hr |
| Apr 20, 1:13 PM MDT | High Wind Watch | BOU | 24 hr |
| Apr 21, 2:14 AM MDT | Red Flag Warning | BOU | 43 hr |
| Apr 21, 1:32 PM MDT | High Wind Warning | BOU | 31 hr |
| Apr 23, 3:58 AM MDT | High Wind Warning | BOU | 15 hr |
| Apr 27, 4:18 PM MDT | Special Weather Statement | BOU | 42 min |
| May 1, 6:57 PM MDT | Severe Thunderstorm Warning | BOU | 33 min |
| May 1, 7:28 PM MDT | Severe Thunderstorm Warning | BOU | 32 min |
| May 1, 8:00 PM MDT | Severe Thunderstorm Warning | BOU | 30 min |
| May 1, 8:08 PM MDT | Special Weather Statement | BOU | 37 min |
| May 1, 8:43 PM MDT | Special Weather Statement | BOU | 32 min |
| May 1, 9:22 PM MDT | Special Weather Statement | BOU | 23 min |
| May 5, 2:47 PM MDT | Fire Weather Watch | BOU | 24 hr |
| May 6, 2:27 PM MDT | Red Flag Warning | BOU | 31 hr |
| May 8, 3:53 AM MDT | Fire Weather Watch | BOU | 24 hr |
| May 9, 2:17 PM MDT | Fire Weather Watch | BOU | 24 hr |
| May 10, 2:09 PM MDT | Red Flag Warning | BOU | 31 hr |
| May 11, 4:40 AM MDT | Fire Weather Watch | BOU | 22 hr |
| May 11, 2:18 PM MDT | Red Flag Warning | BOU | 30 hr |
| May 12, 8:23 PM MDT | Fire Weather Watch | BOU | 6 hr |
| May 13, 2:23 AM MDT | Red Flag Warning | BOU | 18 hr |
| May 17, 3:12 PM MDT | Fire Weather Watch | BOU | 23 hr |
| May 17, 3:48 PM MDT | Special Weather Statement | BOU | 42 min |
| May 18, 1:30 PM MDT | Special Weather Statement | BOU | 45 min |
| May 18, 2:16 PM MDT | Red Flag Warning | BOU | 30 hr |
| May 20, 2:42 AM MDT | Freeze Warning | BOU | 31 hr |
| May 21, 2:43 PM MDT | Freeze Warning | BOU | 17 hr |
| May 27, 4:06 PM MDT | Special Weather Statement | BOU | 54 min |
| Jun 3, 6:10 PM MDT | Severe Thunderstorm Warning | BOU | 50 min |
| Jun 4, 2:17 PM MDT | Mesoscale Discussion | SPC | 88 min |
| Jun 6, 4:20 PM MDT | Special Weather Statement | BOU | 25 min |
| Jun 7, 12:26 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 7, 2:17 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 7, 2:44 PM MDT | Severe Thunderstorm Warning | BOU | 46 min |
| Jun 7, 3:17 PM MDT | Severe Thunderstorm Warning | BOU | 43 min |
| Jun 7, 3:50 PM MDT | Severe Thunderstorm Warning | BOU | 40 min |
| Jun 7, 4:00 PM MDT | Severe Thunderstorm Warning | BOU | 45 min |
| Jun 7, 4:46 PM MDT | Special Weather Statement | BOU | 44 min |
| Jun 7, 7:59 PM MDT | Special Weather Statement | BOU | 31 min |
| Jun 7, 8:09 PM MDT | Severe Thunderstorm Warning | BOU | 36 min |
| Jun 9, 5:40 PM MDT | Special Weather Statement | BOU | 35 min |
| Jun 12, 2:27 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 12, 3:40 PM MDT | Severe Thunderstorm Warning | BOU | 35 min |
| Jun 12, 3:46 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 12, 7:19 PM MDT | Severe Thunderstorm Warning | BOU | 41 min |
| Jun 14, 8:56 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 16, 2:54 PM MDT | Heat Advisory | BOU | 30 hr |
| Jun 27, 2:27 PM MDT | Fire Weather Watch | BOU | 23 hr |
| Jun 28, 1:56 PM MDT | Red Flag Warning | BOU | 29 hr |
| Jul 5, 5:36 PM MDT | Special Weather Statement | BOU | 24 min |
| Jul 5, 5:50 PM MDT | Special Weather Statement | BOU | 25 min |
| Jul 6, 2:09 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 6, 4:32 PM MDT | Mesoscale Discussion | SPC | 118 min |
| Jul 6, 5:43 PM MDT | Special Weather Statement | BOU | 32 min |
| Jul 6, 6:14 PM MDT | Tornado Warning | BOU | 31 min |
| Jul 6, 6:44 PM MDT | Tornado Warning | BOU | 31 min |
| Jul 6, 6:58 PM MDT | Tornado Warning | BOU | 19 min |
| Jul 6, 7:22 PM MDT | Severe Thunderstorm Warning | BOU | 38 min |
| Jul 6, 7:25 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 7, 3:36 PM MDT | Mesoscale Discussion | SPC | 114 min |
| Jul 8, 2:13 PM MDT | Heat Advisory | BOU | 30 hr |
| Jul 8, 5:05 PM MDT | Special Weather Statement | BOU | 25 min |
| Jul 8, 5:27 PM MDT | Severe Thunderstorm Warning | BOU | 33 min |
| Jul 8, 5:35 PM MDT | Severe Thunderstorm Warning | BOU | 26 min |
| Jul 8, 6:00 PM MDT | Severe Thunderstorm Warning | BOU | 45 min |
| Jul 8, 6:25 PM MDT | Severe Thunderstorm Warning | BOU | 35 min |
| Jul 10, 2:24 PM MDT | Mesoscale Discussion | SPC | 96 min |
| Jul 12, 6:00 PM MDT | Severe Thunderstorm Warning | BOU | 45 min |
| Jul 12, 6:30 PM MDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 12, 6:36 PM MDT | Severe Thunderstorm Warning | BOU | 39 min |
| Jul 12, 7:11 PM MDT | Special Weather Statement | BOU | 49 min |
| Jul 12, 8:01 PM MDT | Special Weather Statement | BOU | 44 min |
| Jul 17, 1:50 PM MDT | Heat Advisory | BOU | 31 hr |
| Jul 21, 3:32 PM MDT | Heat Advisory | BOU | 28 hr |
| Jul 24, 2:25 AM MDT | Flood Watch | BOU | 18 hr |
| Jul 24, 2:37 PM MDT | Mesoscale Discussion | SPC | 113 min |
| Jul 24, 5:10 PM MDT | Special Weather Statement | BOU | 50 min |
| Jul 24, 5:36 PM MDT | Severe Thunderstorm Warning | BOU | 39 min |
| Jul 26, 1:37 PM MDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 27, 7:29 PM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 27, 8:42 PM MDT | Severe Thunderstorm Warning | BOU | 34 min |
| Jul 27, 9:22 PM MDT | Severe Thunderstorm Warning | BOU | 38 min |
| Jul 27, 9:58 PM MDT | Areal Flood Advisory | BOU | 3 hr |
| Jul 27, 10:26 PM MDT | Severe Thunderstorm Warning | BOU | 34 min |
| Jul 27, 10:46 PM MDT | Mesoscale Discussion | SPC | 89 min |
| Jul 27, 10:48 PM MDT | Flash Flood Warning | BOU | 117 min |
| Jul 27, 10:59 PM MDT | Severe Thunderstorm Warning | BOU | 46 min |
| Jul 27, 11:15 PM MDT | Severe Thunderstorm Warning | BOU | 45 min |
| Jul 27, 11:43 PM MDT | Severe Thunderstorm Warning | BOU | 32 min |
| Jul 27, 11:50 PM MDT | Areal Flood Advisory | BOU | 115 min |
| Jul 27, 11:58 PM MDT | Areal Flood Advisory | BOU | 2 hr |
| Jul 28, 12:02 AM MDT | Flash Flood Warning | BOU | 118 min |
| Jul 28, 12:10 AM MDT | Severe Thunderstorm Warning | BOU | 35 min |
| Jul 28, 12:35 AM MDT | Mesoscale Discussion | SPC | 55 min |
| Jul 28, 1:14 AM MDT | Areal Flood Advisory | BOU | 2 hr |
| Jul 28, 1:18 AM MDT | Flash Flood Warning | BOU | 117 min |
| Jul 28, 2:03 AM MDT | Areal Flood Warning | BOU | 3 hr |
| Jul 28, 3:07 AM MDT | Areal Flood Advisory | BOU | 113 min |
| Jul 28, 11:08 AM MDT | Areal Flood Advisory | BOU | 7 hr |
| Aug 6, 6:03 PM MDT | Mesoscale Discussion | SPC | 87 min |
| Aug 15, 3:52 PM MDT | Mesoscale Discussion | SPC | 83 min |
| Sep 7, 2:13 AM MDT | Fire Weather Watch | BOU | 13 hr |
| Sep 7, 7:27 AM MDT | Heat Advisory | BOU | 37 hr |
| Sep 7, 3:19 PM MDT | Red Flag Warning | BOU | 29 hr |
| Oct 1, 4:50 PM MDT | Special Weather Statement | BOU | 40 min |
| Oct 1, 5:35 PM MDT | Special Weather Statement | BOU | 40 min |
| Oct 1, 6:40 PM MDT | Special Weather Statement | BOU | 50 min |
| Oct 7, 3:17 PM MDT | Frost Advisory | BOU | 17 hr |
| Oct 8, 1:16 PM MDT | Frost Advisory | BOU | 19 hr |
| Oct 10, 4:02 PM MDT | Red Flag Warning | BOU | 27 hr |
| Oct 12, 2:32 PM MDT | Frost Advisory | BOU | 17 hr |
| Oct 13, 2:41 AM MDT | Fire Weather Watch | BOU | 10 hr |
| Oct 13, 12:49 PM MDT | Red Flag Warning | BOU | 29 hr |
| Oct 15, 1:49 PM MDT | Freeze Watch | BOU | 12 hr |
| Oct 16, 1:40 AM MDT | Freeze Warning | BOU | 31 hr |
| Oct 18, 3:31 AM MDT | Fire Weather Watch | BOU | 10 hr |
| Oct 18, 1:30 PM MDT | Red Flag Warning | BOU | 29 hr |
| Oct 21, 2:46 PM MDT | Red Flag Warning | BOU | 28 hr |
| Oct 22, 1:58 PM MDT | Red Flag Warning | BOU | 29 hr |
| Nov 7, 2:10 PM MST | Fire Weather Watch | BOU | 24 hr |
| Nov 8, 2:37 PM MST | Red Flag Warning | BOU | 28 hr |
| Dec 1, 2:36 AM MST | High Wind Watch | BOU | 11 hr |
| Dec 1, 2:36 AM MST | High Wind Warning | BOU | 38 hr |
| Dec 2, 10:11 AM MST | Blowing Dust Advisory | BOU | 7 hr |
| Dec 2, 12:29 PM MST | Dust Storm Warning | BOU | 3 hr |
| Dec 2, 2:59 PM MST | Dust Storm Warning | BOU | 2 hr |
| Dec 8, 4:51 AM MST | Dense Fog Advisory | BOU | 3 hr |
| Dec 11, 3:56 AM MST | Winter Storm Watch | BOU | 32 hr |
| Dec 11, 3:56 AM MST | Winter Weather Advisory | BOU | 4 days |
| Dec 12, 2:57 AM MST | Blizzard Warning | BOU | 41 hr |
| Dec 13, 3:24 AM MST | Mesoscale Discussion | SPC | 5 hr |
| Dec 13, 10:14 AM MST | Mesoscale Discussion | SPC | 3 hr |
| Dec 13, 1:41 PM MST | Mesoscale Discussion | SPC | 4 hr |
| Dec 19, 4:07 AM MST | Wind Chill Watch | BOU | 35 hr |
| Dec 20, 2:59 PM MST | Wind Chill Warning | BOU | 68 hr |
| Dec 20, 2:59 PM MST | Winter Weather Advisory | BOU | 42 hr |
| Dec 23, 3:06 AM MST | Wind Chill Advisory | BOU | 29 hr |
| Dec 26, 1:41 PM MST | Winter Weather Advisory | BOU | 66 hr |
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20212023
Sources
National Weather Service watches, warnings, advisories and statements from the Iowa Environmental Mesonet's VTEC archive, which reconstructs tornado, severe thunderstorm, flash flood and marine warnings back to 1986 from the NWS text archive. Storm Prediction Center watches and mesoscale discussions from SPC's archive through the Mesonet. County centers from the US Census Bureau. Warning verification from the Mesonet's Cow. Rebuilt daily.